9.3.7.a setindex element rules
You must see an xforms-scroll-first message when you activate the Set Index To -1 trigger.
The Index must be set to 1.
Set Index To -1
You must see an xforms-scroll-last message when you activate the Set Index To 100 trigger.
The Index must be set to 3.
Set Index To 100
You must NOT see a message when you hit the Set Index To 2 trigger.
The Index must be set to 2.
Set Index To 2xforms-scroll-firstxforms-scroll-lastIndex :